package pers.csw.lookBook.server;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import org.springframework.stereotype.Component;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;

@Component
@ServerEndpoint("/wsserver/{userId}")
public class WebSocketServer {
    /**用来记录当前在线连接数。应该把它设计成线程安全的。*/
    private static int onlineCount = 0;
    /**concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。*/
    private static ConcurrentHashMap<String, WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**与某个客户端的连接会话，需要通过它来给客户端发送数据*/
    private Session session;
    /**接收userId*/
    private String userId="";

    @OnOpen
    public void onOpen(Session session, @PathParam("userId") String userId){
        this.session = session;
        this.userId = userId;
        if(webSocketMap.containsKey(userId)){
            webSocketMap.remove(userId);
            //加入set中
            webSocketMap.put(userId,this);
        }else{
            //加入set中
            webSocketMap.put(userId,this);
            //在线用户加1
            addOnlineCount();
        }
        System.out.println("用户连接："+userId+",当前在线人数为："+getOnlineCount());
//        try {
//            sendMessage("连接成功");
//        } catch (IOException e) {
//            System.out.println("用户:"+userId+",网络异常!!!!!!");
//        }
    }

    @OnClose
    public void onClose(){
        if(webSocketMap.containsKey(userId)){
            webSocketMap.remove(userId);
            if(getOnlineCount()>0){
                subOnlineCount();
            }
        }
        System.out.println("用户连接："+userId+",当前在线人数为："+getOnlineCount());
    }

    @OnMessage
    public void onMessage(String message,Session session){
        System.out.println("用户消息:"+userId+",报文:"+message);
        if(StrUtil.isEmpty(message)){
            try {
                JSONObject jsonObject = JSONUtil.parseObj(message);
                jsonObject.set("fromUserId", this.userId);
                String toUserId= (String) jsonObject.get("toUserId");
                if(StrUtil.isEmpty(toUserId)&&webSocketMap.containsKey(toUserId)){
                    webSocketMap.get(toUserId).sendMessage(jsonObject.toString());
                }else{
                    //否则不在这个服务器上，发送到mysql或者redis
                    System.out.println("请求的userId:"+toUserId+"不在该服务器上");
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("用户错误:"+this.userId+",原因:"+error.getMessage());
        error.printStackTrace();
    }

    /**
     * 发送自定义消息
     * */
    public static void sendInfo(String message,@PathParam("userId") String userId) throws IOException {
        System.out.println("发送消息到:"+userId+"，报文:"+message);
        if(StringUtils.isNotBlank(userId)&&webSocketMap.containsKey(userId)){
            webSocketMap.get(userId).sendMessage(message);
        }else{
            System.out.println("用户"+userId+",不在线！");
        }
    }



    /**
     * 实现服务器主动推送消息
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    //获取当前在线人数
    public static synchronized int getOnlineCount(){
        return onlineCount;
    }
    //在线用户加1
    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }
    //在线用户减1
    public static synchronized void subOnlineCount(){
        WebSocketServer.onlineCount--;
    }


}
